Question

我的所有微调器都是相互连接的，它们不是独立的，我想根据spinner1中的选择显示spinner2和spinner3中的选项（我的意思是基于用户在spinner1中选择的类别）

在onCreate我将数据填充到Spinners中，但是在spinner2和spinner3中我得到的数据属于CategoryB，而它们只能填充CategoryA数据。

那我的错误在哪里？这是我的JSON解析代码：

               categoryArrayList = new ArrayList<Category>();
               cArrayList = new ArrayList<String>();

                ...................................

                // Array Level 1 --- START
            JSONArray jarray = jsono.getJSONArray("categories");

            for (int i = 0; i < jarray.length(); i++) {
                JSONObject object = jarray.getJSONObject(i);

                Category language = new Category();                     
                language.setName(object.getString("category_name"));
                Log.d("category_name::-", object.getString("category_name"));

                language.setTypeArrayList(typeArrayList);
                categoryArrayList.add(language);
                cArrayList.add(categoryArrayList.get(i).getName());

                // Array Level 1 --- END

                // Array Level 2 --- START

                JSONArray jsarray = object.getJSONArray("types");
                typeArrayList = new ArrayList<Type>();
                tArrayList = new ArrayList<String>();
                for (int j = 0; j < jsarray.length(); j++) {
                    JSONObject jjobject = jsarray.getJSONObject(j);

                    Type genre = new Type();

                    genre.setName(jjobject.getString("type_name"));
                    Log.d("type_name::-", jjobject.getString("type_name"));     

                    genre.setServiceArrayList(serviceArrayList);
                    typeArrayList.add(genre);
                    tArrayList.add(typeArrayList.get(j).getName());     

                    // Array Level 2 --- END

                    // Array Level 3 --- START

                    JSONArray jsonarray = jjobject.getJSONArray("services");
                    serviceArrayList = new ArrayList<Service>();
                    sArrayList = new ArrayList<String>();
                    for (int k = 0; k < jsonarray.length(); k++) {
                        JSONObject jjjobject = jsonarray.getJSONObject(k);

                        Service movie = new Service();

                        movie.setName(jjjobject.getString("service_name"));
                        Log.d("service_name::-", jjjobject.getString("service_name"));

                        serviceArrayList.add(movie);    
                        sArrayList.add(serviceArrayList.get(k).getName());

                        // Array Level 3 --- END
                    }

                }       

            }

            return true;
        }

以下是我如何填充Spinners：

            spinner1.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
                     android.R.layout.simple_spinner_dropdown_item,
                     cArrayList));

            spinner2.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
                    android.R.layout.simple_spinner_dropdown_item,
                    tArrayList));

            spinner3.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
                    android.R.layout.simple_spinner_dropdown_item,
                    sArrayList));

Answer 1

奥利奥。这是完整的代码。

类别类

public class Category {

    String name;
    ArrayList<ArrayList<Type>> type;
    Category()
    {
        name = "";
        type = new ArrayList<ArrayList<Type>>(); 
    }

    void setName(String s)
    {
        name =s;
    }

    public String getName()
    {
        return name;
    }

    void setTypeArrayList(ArrayList<Type> serviceArrayList)
    {
        type.add(serviceArrayList);
    }

    ArrayList<Type> getTypeArrayList(int i)
    {
        return type.get(i);
    }
}

输入课程

import java.util.ArrayList;

public class Type {
    String type;
    ArrayList<ArrayList<Service>> service;

    public Type() {
        // TODO Auto-generated constructor stub
        type = "";
        service = new ArrayList<ArrayList<Service>>();
    }
    void setName(String s)
    {
        type =s;
    }

    public String getName()
    {
        return type;
    }

    void setServiceArrayList(ArrayList<Service> serviceArrayList)
    {
        service.add(serviceArrayList);
    }

    ArrayList<Service> getServiceArrayList(int i)
    {
        return service.get(i);
    }
}

服务类

public class Service {

    String service;

    public Service() {
        // TODO Auto-generated constructor stub
        service ="";
    }

    void setName(String s)
    {
        service =s;
    }

    public String getName()
    {
        return service;
    }
}

初始化全局

 int catpos =0;
 ArrayList<Category> categoryArrayList = new ArrayList<Category>();
 ArrayList<String> cArrayList = new ArrayList<String>();
 ArrayList<Type> typeArrayList;
 ArrayList<Service> serviceArrayList;

doInbackground

    //your http request and response process


    JSONObject jsono;
    try {
        jsono = new JSONObject(data);

        JSONArray jarray = jsono.getJSONArray("categories");

        for (int i = 0; i < jarray.length(); i++) {
            JSONObject object = jarray.getJSONObject(i);

            Category language = new Category();
            language.setName(object.getString("category_name"));
            Log.d("category_name::-", object.getString("category_name"));

            JSONArray jsarray = object.getJSONArray("types");
            typeArrayList = new ArrayList<Type>();
            tArrayList = new ArrayList<String>();
            for (int j = 0; j < jsarray.length(); j++) {
                JSONObject jjobject = jsarray.getJSONObject(j);

                Type genre = new Type();

                genre.setName(jjobject.getString("type_name"));
                Log.d("type_name::-", jjobject.getString("type_name"));

                JSONArray jsonarray = jjobject.getJSONArray("services");
                serviceArrayList = new ArrayList<Service>();
                sArrayList = new ArrayList<String>();
                for (int k = 0; k < jsonarray.length(); k++) {
                    JSONObject jjjobject = jsonarray.getJSONObject(k);

                    Service movie = new Service();

                    movie.setName(jjjobject.getString("service_name"));
                    Log.d("service_name::-",
                            jjjobject.getString("service_name"));

                    serviceArrayList.add(movie);
                    sArrayList.add(serviceArrayList.get(k).getName());
                }
                genre.setServiceArrayList(serviceArrayList);
                typeArrayList.add(genre);
                tArrayList.add(typeArrayList.get(j).getName());
            }

            language.setTypeArrayList(typeArrayList);
            categoryArrayList.add(language);
            cArrayList.add(categoryArrayList.get(i).getName());

        }
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

onPostExecute方法

    tArrayList = new ArrayList<String>();
    sArrayList = new ArrayList<String>();

    Category c = categoryArrayList.get(0);      
    typeArrayList = c.getTypeArrayList(0);
    for(int i=0;i<typeArrayList.size();i++)
        tArrayList.add(typeArrayList.get(i).getName());
    Type t = typeArrayList.get(0);
    serviceArrayList = t.getServiceArrayList(0);
    for(int i=0;i<serviceArrayList.size();i++)
        sArrayList.add(serviceArrayList.get(i).getName());

    spinner1.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
            android.R.layout.simple_spinner_dropdown_item, cArrayList));

    spinner2.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
            android.R.layout.simple_spinner_dropdown_item, tArrayList));


    spinner3.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
            android.R.layout.simple_spinner_dropdown_item, sArrayList));

    spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        public void onItemSelected(AdapterView<?> parent, View view,
                int pos, long id) {

            catpos = pos;
            tArrayList = new ArrayList<String>();
            sArrayList = new ArrayList<String>();
            Category c = categoryArrayList.get(pos);        
            typeArrayList = c.getTypeArrayList(0);
            for(int i=0;i<typeArrayList.size();i++)
                tArrayList.add(typeArrayList.get(i).getName());
            Type t = typeArrayList.get(0);
            serviceArrayList = t.getServiceArrayList(0);
            for(int i=0;i<serviceArrayList.size();i++)
                sArrayList.add(serviceArrayList.get(i).getName());

            spinner2.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
                    android.R.layout.simple_spinner_dropdown_item, tArrayList));


            spinner3.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
                    android.R.layout.simple_spinner_dropdown_item, sArrayList));


        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub

        }
    });

    spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        public void onItemSelected(AdapterView<?> parent, View view,
                int pos, long id) {

            sArrayList = new ArrayList<String>();
            Category c = categoryArrayList.get(catpos);     
            typeArrayList = c.getTypeArrayList(0);              
            Type t = typeArrayList.get(pos);
            serviceArrayList = t.getServiceArrayList(0);
            for(int i=0;i<serviceArrayList.size();i++)
                sArrayList.add(serviceArrayList.get(i).getName());

            spinner3.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
                    android.R.layout.simple_spinner_dropdown_item, sArrayList));                
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub

        }
    });

Answer 2

我的策略是：

1）首先，填充微调器1 并根据所选项目（第一项）填充微调器2,3 旋转器1。

2）放置spinner1.setOnItemSelectedListener()并在此方法内的 spinner 1 上更改项目时发送事件。要发送活动，请使用Otto。

3）在Otto，Activity和Fragment上注册该事件@Subscribe。因此，当您在微调器1 中选择项目时，您将立即在@Subscribe内收到通知，并且您必须使用spinner1.setAdapter()更改微调器2,3 并且spinner2.setAdapter()在那里。

Answer 3

您tArrayList的填充错误。您可以使用以下代码填充您的Spinner：

        spinner2.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
                android.R.layout.simple_spinner_dropdown_item,
                tArrayList));

但是变量tArrayList只获取它读取的最后一个值。您正在使用for循环，但在每个循环上重新启动tArrayList 变量，因此最后它只有最后一个值。

[...]
for (int i = 0; i < jarray.length(); i++) {
        [...]
        tArrayList = new ArrayList<String>();

其中一个解决方案可能是这样的：

创建列表列表
在每个循环中，您创建一个新的tArrayList变量并对其进行初始化。
在第二个for循环结束时（填充它），将创建的列表添加到全局列表列表中。
当您从spinner1中选择并选择时，您将从列表列表中获取该位置，并使用它来填充您的spinner2。

List<List<String>> tArrayListOfLists = new ArrayList<ArrayList<>>();
for(...){ // First for loop
    List<String> tArrayList = new ArrayList<>();
    for(...) { // Second for loop
         tArrayList.add("your strings");
    }
    tArrayListOfLists.add(tArrayList);
}

然后，您将获得包含所需项目的列表列表。要在微调器上列出用户选择并填充它：

spinner1.setOnItemSelectedListener(new OnItemSelectedListener() 
{
    @Override
    public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) 
    {
        // Get the selected position
        List<String> selectedList = tArrayListOfLists.get(position);

        spinner2.setAdapter(new ArrayAdapter<String>(CategoryActivity.this,
        android.R.layout.simple_spinner_dropdown_item, selectedList));
    }

    @Override
    public void onNothingSelected(AdapterView<?> parentView) {
        // Clear the list 2
    }
});

Answer 4

取自this site：

此示例显示如何根据第一个微调器的选择填充第二个微调器。

XML：布局文件条目

<强> RES /布局/ activity_spinner_ex4.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <!-- Label -->

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="8dip"
        android:text="@string/lblAcc" />

    <!-- Spinner Dropdown -->

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dip"
        android:layout_marginRight="8dip"
        android:layout_marginTop="10dip"
        android:entries="@array/acc_type" />

    <!-- Select Label -->

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="8dip"
        android:text="@string/lblSubAcc" />

    <!-- Spinner Dropdown -->
    <Spinner
        android:id="@+id/spinner2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dip"
        android:layout_marginLeft="8dip"
        android:layout_marginRight="8dip"
    />
</LinearLayout>

XML：字符串文件条目

<强> RES /值/ strings.xml中

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Spinner Example</string>
    <string name="action_settings">Settings</string>
    <string name="lblAcc">Select Account Type</string>
    <string name="lblSubAcc">Select Account Head</string>

    <string-array name="acc_type">
        <item>Income</item>
        <item>Expense</item>
    </string-array>

</resources>

主要活动

<强> SpinnerEx4Activity.java

package com.bar.example.androidspinnerexample;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Toast;

public class SpinnerEx4Activity extends Activity implements
OnItemSelectedListener{
Spinner s1,s2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_spinner_ex4);
        s1 = (Spinner)findViewById(R.id.spinner1);
        s2 = (Spinner)findViewById(R.id.spinner2);
        s1.setOnItemSelectedListener(this);
    }
    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {
        // TODO Auto-generated method stub
        String sp1= String.valueOf(s1.getSelectedItem());
        Toast.makeText(this, sp1, Toast.LENGTH_SHORT).show();
        if(sp1.contentEquals("Income")) {
            List<String> list = new ArrayList<String>();
            list.add("Salary");
            list.add("Sales");
            list.add("Others");
            ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, list);
            dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            dataAdapter.notifyDataSetChanged();
            s2.setAdapter(dataAdapter);
        }
        if(sp1.contentEquals("Expense")) {
            List<String> list = new ArrayList<String>();
            list.add("Conveyance");
            list.add("Breakfast");
            list.add("Purchase");
            ArrayAdapter<String> dataAdapter2 = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, list);
            dataAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            dataAdapter2.notifyDataSetChanged();
            s2.setAdapter(dataAdapter2);
        }

    }
    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }
}

旋转器的JSON解析问题

4 个答案: